Malicious PDF — malware analysis report

Static analysis result for SHA-256 204ac9ff10cf5e0c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 05:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 651ea6211d50c639cc2a801d2943bcfb SHA-1: 16403d2ca977720a0b7f6d7fb06a945d2413f5b7 SHA-256: 204ac9ff10cf5e0c9f6461219931eddb91e7955424eac9065b0b512eb598f444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for SEO poisoning or to host phishing lures. The presence of external URIs and the nature of the links indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gruaszarate.com/ckfinder/userfiles/files/liliwolela.pdf In PDF document text
    • https://autonoleggioassereto.com/file/dominuvegixadetapi.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tubulavotono.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc4ec2c987---ramenejuzigezegunujolij.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/8759171304.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/25448399598.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/fulofuwibatotixesezogu.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/80389948645.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/zuvekigilejovodoku.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/898c9662cb01164da48002f80e644013/93461050187.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/2365231821.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210901_683BE185DB5801DC.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/rapisuvedefawedo.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/puxenitinuvawaraxutusat.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161374a9d8d64f---24474931828.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/vesevajuwevovilinasene.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a5d0f59db758e8256d5f92012d32d80c/82446892313.pdfIn PDF document text
    • http://fruitvita.com/files/files/14666255617.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f907bcc9423cc9c6f9088fb947549a8f/natuzarebonizokonuxekebi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf98e347a---10892444682.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/11965638784.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/genupokisix.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/mizigeg.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/b8l7r89hg7ulpcv9eepsuenb07/45154044624.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/safugojumixosasit.pdfIn PDF document text
    • http://lex.tj/img/file/45784952017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=naresh+malhotra+research+methodology+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 10964 bytes
SHA-256: c75a073c12281f032fffb6c72d1a294a2c5f14ef4414dda92a81b5c07fa987f9
font_02_sfnt_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 16480 bytes
SHA-256: ba68ff773e4d3cdecad3237e26a167fbcebfeaa1f517c636e84c75a33767757f

Open this report in the interactive analyzer, or submit your own file for analysis.